[Marianna]

Everyone has some certain flexibility that can be enhanced. But not everyone will achieve the same results.
I can (and was always) able to do the split one way, when your legs are forward / backward. I don't know what the name is. The other type, which I think is called Chinese splits, have never been able to do and I have tried.
in 2005 during a bd performance I injured myself, by going to a slit from standing. I felt something torn. Obviously something went wrong, because for months I had a hard time stretching my right leg (the one in the front.) In my modern dance classes we did all kinds of stretches, and although it didn't hurt, my hamstring would just not go.
I thought I could never do stretches again, so I gave up, but a couple of years later (2007) I trained myself to do the split with the left leg in the front. That way was always hard, and couldn't even go down halfway, but in a few months - maybe - less I was able to do it.
I just did gentle stretches few times a week, stretching the hamstring, quads and hipflexor.
Now, about a year ago (3 years after the injury) I can do the split like I used to, one day started practicing and in a few days, I got it. It just happened. It feels so good to do it, needless to say my left leg has lost the flexibility (it was never as good as the right one, but I could do it).

So my story shows, you 'probably' are able to do it within a couple of months if you stretch a few times a week. Don't overdo it, be gentle, and if it's not happening, then just accept that.
Oh and by the way I was way over 26 when all of this happened ;)